Intermetallic Alloys and Intermatallic Matrix Composites

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Matrix Composites".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 1984

Special Issue Editor


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Guest Editor
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127 Youyixi Road, Xi’an 710072, China
Interests: electron microscopy and in situ synchrotron radiation high-energy X-ray diffraction analysis of phase transformation mechanism; deformation mechanism and microstructure stability of TiAl intermetallic compounds and superalloys

Special Issue Information

Dear Colleagues,

Intermetallic compounds such as Ti-Al, Ni-Ti, Nb-Si, Mo-Si, and their composites are widely used in the aerospace, automotive, and energy fields. There are still many basic scientific uncertainties to be solved in these materials, such as phase transformation, deformation, interface reaction, etc., which are closely related to their applications. In addition, advanced characterization methods, such as transmission electron microscopy, atomic probe tomography, and synchrotron radiation diffraction, have been widely used in intermetallic compounds and their composites. In recent years, a number of high-level research results have been obtained. This Special Issue aims to report the latest research achievements in the field of intermetallic compounds and their composites and promote our understanding of the basic theories and scientific issues therein. Research on novel techniques on the material processing and component applications is also welcomed.

Dr. Lin Song
Guest Editor

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Keywords

  • intermetallics
  • intermetallic-based composites
  • materials characterization
  • phase transformation
  • interface reaction
  • metal processing
  • deformation mechanisms

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Published Papers (1 paper)

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Research

9 pages, 6164 KiB  
Article
A Novel Approach of Microstructure Refinement of TiAl in Laser Beam Welding
by Jie Liu, Shun Guo, Peng Zhang, Tao Ma, Zhuo Wang, Tongli Wu, Li Wang and Kehong Wang
Metals 2023, 13(1), 7; https://doi.org/10.3390/met13010007 - 20 Dec 2022
Cited by 2 | Viewed by 1605
Abstract
Grain refinement through borides is known to be suppressed when TiAl is welded with a laser beam. As β grains do not primarily nucleate on boride at a high cooling rate, a mixture of nitrogen and argon is applied as a protecting gas [...] Read more.
Grain refinement through borides is known to be suppressed when TiAl is welded with a laser beam. As β grains do not primarily nucleate on boride at a high cooling rate, a mixture of nitrogen and argon is applied as a protecting gas for the formation of TiN during solidification. The phase transformation is changed correspondingly from Liquid → Liquid + β → β → α + β → α + γ+ β → α2 + γ + B2 to Liquid → TiN + Liquid → β+ TiN → α + γ + TiN → α2 + γ+ TiN. It is found that β grains prefer to nucleate heterogeneously on the suspending TiN in the melt with orientation relationship {111}TiN//{110}β, leading to refined β grains. α2 colonies that were thus modified into fine non-dendritic grains. The effects of nitrogen as a shielding atmosphere on the microstructure evolution of TiAl are elaborately studied. Full article
(This article belongs to the Special Issue Intermetallic Alloys and Intermatallic Matrix Composites)
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